In Bright Memory: Infinite, your main objectives involve battling enemies, completing missions, and uncovering the story. You must navigate through different environments while utilizing a mix of firearms and melee combat to defeat various foes.

The combat system combines shooting and melee attacks, allowing players to create combos for a more powerful effect. Players can switch weapons rapidly and use special skills to enhance their combat capabilities against enemies.

In Bright Memory: Infinite, you can upgrade skills related to combat efficiency, health, and special abilities. These upgrades can be accessed through the skill tree, where you invest points gained from leveling up.

To manage weapons effectively, switch between firearms and melee weapons depending on the enemy type. Make use of the inventory system to ensure you have the necessary ammunition and equipment for upcoming battles.

Upgrading skills involves several steps: 1. Collect experience points by defeating enemies and completing missions. 2. Access the skill menu from the main interface. 3. Choose the skill tree you want to enhance. 4. Spend the experience points to unlock or upgrade the desired skills. This will enhance your character's abilities and improve your combat experience.